JAVA——超市后台管理系统

//第一部分
package com.company;

public class Article {
    /**
     * 商品类
     */

    //   名字   单价    库存   已卖数量
       public String name;
       public  double  price;
       public  int   amount;
       public  int  number;


    public void setArticle(String mingzi, double danjia,int kucun,int xiaoshou) {
        name = mingzi;
        price = danjia;
        amount = kucun;
        number = xiaoshou;
    }

        public void print(int index){
        System.out.println(index + "\t" + name + "\t" + price + "\t" + amount + "\t" +number);

    }


}


//第二部分
package com.company;

/**
 * 商品集合
 * 仓库进行管理商品
 */
public class ArticleSet {
    Article[] articles=new Article[50];
}


//第三部分

package com.company;

import java.util.Scanner;

public class ArticleManage {
    ArticleSet articleSet=new ArticleSet();
    //仓库初始化，放入一些商品
    public void  initial(){

     Article xiaomi11 =new Article();

       /**         xiaomi11.name="小米11";
         *         xiaomi11.number=30;
         *         xiaomi11.amount=0;
         *         xiaomi11.price=1999;
         *
         */

        xiaomi11.setArticle("小米11",1999,50,0);

        Article  xiaomipro=new Article();
        xiaomipro.setArticle("小米pro", 2999,60,  1);


        Article  xiaomiultra=new Article();
        xiaomiultra.setArticle("小米ultra", 2599,70,  3);


        articleSet.articles[0]=xiaomi11;
        articleSet.articles[1]=xiaomipro;
        articleSet.articles[2]=xiaomiultra;

    }
//启动菜单

    public void startMenu() {
        boolean flag;
        do {
            System.out.println("欢迎使用前台商城管理系统");
            System.out.println("------------------------");
            System.out.println("1.查看商品信息");
            System.out.println("2.新增商品信息");
            System.out.println("3.删除商品信息");
            System.out.println("4.卖出商品信息");
            System.out.println("5.商品销售排行榜");
            System.out.println("6.退出");
            System.out.println("------------------------");
            System.out.println("请选择要执行的操作：");
            Scanner scanner = new Scanner(System.in);
           flag=true;
            int num = scanner.nextInt();
            switch (num) {
                case 1:
                    System.out.println("查看商品信息");
                    chaka();
                    break;
                case 2:
                    System.out.println("新增商品信息");
                    add();
                    break;
                case 3:
                    System.out.println("删除商品信息");
                    delete();
                    break;
                case 4:
                    System.out.println("卖出商品");
                    saleOut();
                    break;
                case 5:
                    System.out.println("商品销售排行榜");
                    leadeBand();
                    break;
                case 6:
                    System.out.println("谢谢使用");
                    flag=false;
                    break;
                default:
                    System.out.println("你输入错误，请再次输入");
            }
        }while (flag);
        }



    public void chaka(){
       System.out.println("编号  \t  名字  \t 单价 \t 库存  \t  已卖 \t  ");
       for (int i=0; i<articleSet.articles.length;i++){
           if (articleSet.articles[i]!=null) {
             articleSet.articles[i].print(i+1);
           }
       }
    }
    public void add(){
        Scanner scanner =  new Scanner(System.in);
        System.out.println("请输入商品的名称");
        String name = scanner.next();
        System.out.println("请输入价格");
        double price = scanner.nextDouble();
        System.out.println("请输入库存");
        int count = scanner.nextInt();
        System.out.println("请输入一卖的数量");
        int number = scanner.nextInt();

        Article newArticle = new Article();
        newArticle.setArticle(name,price,count,number);

        for (int i = 0; i < articleSet.articles.length; i++) {
            if (articleSet.articles[i] == null) {
                articleSet.articles[i] = newArticle; // 把新建的对象放在数组中的第一个空位置
                break; // 后续的空位置直接跳过
            }
        }
    }
    public void delete(){
      System.out.println("请输入要删除的商品编号");
      Scanner scanner=new Scanner(System.in);
      int bianhao=scanner.nextInt();
      boolean flag =true;
      for (int i=0; i<articleSet.articles.length;i++) {
          if (articleSet.articles[i] != null && (i + 1) == bianhao) {
              int j = i;
              while (articleSet.articles[j + 1] != null) {
                  //后面元素向前移动
                  articleSet.articles[j] = articleSet.articles[j + 1];
                  j++;
              }
              articleSet.articles[j] = null;
              flag = true;
              break; //后门的空数组元素没有必要执行


          } else {
              flag = false;
          }

          }
      }

    public   void saleOut() {
            System.out.println("请输入要销售的商品名称");
            Scanner  scanner=new Scanner(System.in);
            String  mingzi=scanner.next();
            for(int i=0;i<articleSet.articles.length;i++){
                if(articleSet.articles[i]!=null&&articleSet.articles[i].name==mingzi){
                    System.out.println("请输入卖出数量");
                    int shuliang=scanner.nextInt();
                    if(shuliang<articleSet.articles[i].amount){
                        articleSet.articles[i].amount=articleSet.articles[i].amount-shuliang;
                        articleSet.articles[i].number=articleSet.articles[i].number+shuliang;
                        System.out.println("成功售出");
                        break;
                    }
                }
            }
        }

    private void leadeBand() {
        for(int i=0; i<articleSet.articles.length-1;i++){
            for(int j=0; j<articleSet.articles.length-i-1;j++){
               if(articleSet.articles[j]!=null&&articleSet.articles[j+1]!=null){//数组中不为空才能参与
                   if(articleSet.articles[j].number<articleSet.articles[j+1].number){
                       Article newTemp=articleSet.articles[j];
                       articleSet.articles[j]=articleSet.articles[j+1];
                       articleSet.articles[j+1]=newTemp;
                   }
               }
            }
        }
//打印结果
        for(int i=0;i<articleSet.articles.length;i++){
            if (articleSet.articles[i]!=null){
            System.out.println((i+1)+"\t"+articleSet.articles[i].name+"\t"+articleSet.articles[i].number);
            }
        }

    }
}


//第四部分
package com.company;

public class Demo {
    public static void main(String[] args) {
        ArticleManage articleManage=new ArticleManage();
        articleManage.initial();
        articleManage.startMenu();
        //
    }
}